“Like the transition from the iPhone 3G to 3GS in 2009, the change from iPhone 4 to 4S is not a cosmetic one,” Jacqui Cheng reports for Ars Technica. “Apple seems to be making a habit of alternating between major cosmetic changes and major internal changes when it comes to iPhone hardware, and this is definitely an “internal change” kind of year. But it’s what’s inside that counts, right?”

Cheng reports, “Several friends asked me if they should upgrade from a iPhone 3G/3GS to the $99 8GB iPhone 4 instead. I think this would be a poor decision when the faster iPhone 4S is available with a better camera, better antenna, and Siri for only a bit more (especially when factored over the length of a cell phone contract).”

“Certainly, we had moments during our testing when we laughed at Siri’s clever ability to decipher our casual language and not only deliver a result, but a very specific and accurate result,” Cheng reports. “A query about how many calories were in a tortilla provided the answer plus a whole host of other nutritional information. A query about how to find a small neighborhood market switched over to the Maps app and showed me directions between the market and my current location. When asked where one of my friends was (we were meeting up at a certain time and he was late), Siri looked up that friend in Find My Friends before showing me a map of his current location.”

Much more, including benchmarks, in the full, comprehensive review here.

Related articles:
Bajarin: Apple’s iPhone 4S with Siri launch a pivotal moment in tech, but many missed its significance – October 17, 2011
Apple gave Siri AI personal assistant its edge – October 16, 2011
PC Magazine reviews Apple iOS 5: The best phone and tablet OS, Editors’ Choice – October 15, 2011
PC Magazine reviews Apple iPhone 4S: Editors’ Choice – October 15, 2011
Wired reviews Apple iPhone 4S: The ‘S’ stands for Siri, a life-changer, the reason people should buy this phone – October 12, 2011
USA Today’s Baig reviews iPhone 4S: Apple takes world’s finest smartphone to even loftier heights – October 12, 2011
WSJ’s Walt Mossberg reviews Apple iPhone 4S: Siri artificial-intelligence has to be tried to be believed – October 12, 2011
NY Times’ Pogue reviews Apple iPhone 4S: Conceals sheer, mind-blowing magic – October 12, 2011